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C大学教程课后习题答案15
Chapter 16
Exception Handling
1. Solutions to and Remarks on Selected Programming Problems
1 Time
Write a program to covnert from 24-hour time to 12-hour time.
Remarks:
The text gives sample dialog. The code I give produces a slightly different dialog that diagnoses particular input errors by providing an appropriate message to the exception object at the point the error is detected and the exception is thrown. This solution is only slightly more complex than a solution that gives the requested dialog.
I used the class DigtalTime from Chapter 11 as a starting point. I removed functions not needed, and replaced the terminating error reporting code with calls to the required exception, TimeFormatError. I provided error messages appropriate to the particular errors as detected. I then inserted the try-catch blocks, terminating the program at the error. After this was running, I provided the loop, to request repetition.
Bug (perhaps a quirk?): If an input error causes an exception to be thrown, the code diagnoses the error, then immediately requests another 24 hour time for converstion without requesting approval from the user.
// dtime.h
// Taken from Chapter 11
//
// This is the HEADER FILE dtime.h. This is a reduction of
//the INTERFACE for the class DigitalTime from Chapter 11 for
//Chapter 16 Programming Problem 1. The operator== and
//Advance members are not needed so I deleted them. I have
//added the required exception class TimeFormatMistake.
//
// Values of this type are times of day. The values are
//input and output in 24 hour notation as in 9:30 for 9:30
//AM and 14:45 for 2:45 PM.
#ifndef DTIME_H
#define DTIME_H
#include string
#include iostream
using namespace std;
class TimeFormatMistake
{
public:
TimeFormatMistake(std::string mesg) throw ()
{
message = mesg;
}
string what() throw()
{
return message;
}
private:
std::string message;
};
class DigitalTime
{
public:
DigitalTime(int the_hour,
int the_minute) thr
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